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Product Features

  • Fully Programmable 32-bit MCU
  • Integrated 600V DC/DC Flyback controller
  • Integrated 600V Gate Drivers (250mA/500mA)
  • Integrated 23V/40mA Open-drain Drivers
  • Integrated PGA (3 Differential, 4 Single-ended)
  • Integrated DACs and Comparators
  • UART, I2C and SPI serial interfaces
  • Extremely low total hibernate mode
  • Minimal external component
  • IEC/UL60730 Class B Optimized
  • 10x10mm, 57-pin QFN

The PAC5255 belongs to Active-Semi’s Power Application Controller® (PAC®) family. The PAC® family of products are highly-optimized SOC devices that can implement BLDC or PMSM programmable motor controller and driver in a single integrated IC. The PAC5255 integrates a FLASH-based MCU, Power Management, High-side and low-side Gate Drivers and Signal-Conditioning components in a single product.

The PAC5255 is optimized for AC-Powered BLDC or PMSM motor control applications such as AC-powered fans, white goods or compressors that require IEC/UL 60730 Class B Safety.

The PAC5255 contains a 50MHz Arm® Cortex®-M0 with 32kB of FLASH that can be used to implement high-performance motor control and supervisory applications. The MCU also contains motor control peripherals such as 10b 1MSPS dual auto-sequencer ADC, PWM timers with hardware dead-time insertion, etc. The Multi-Mode Power Manager™ (MMPM) contains a Flyback DC/DC controller and power management components for powering the IC and other PCB system power supplies. The Application-Specific Power Drivers™ provide integrated gate drivers for use with an external inverter. The Configurable Analog Front-End™ (CAFE) provides signal-chain components such as differential and single-end amplifiers, comparators and DACs.


Advantages of our Intelligent Motor Control

Programmable 32-bit MCU Allows implementation of high-performance advanced control algorithms such as Field Oriented Control (FOC), Sensorless BEMF, Sensored BLDC and serial communications protocols
Integrated Power Manager Removes the need for an external DC/DC Controller. Provides 5V/200mA system supply for additional PCB peripherals. Integrates all power rails for MCU, FLASH, Analog and gate drivers
Integrated Gate Drivers 3 600V integrated high-side and 4 integrated low-side gate drivers for 3-phase inverters
Integrated Signal Chain Allows integrated Current, Voltage and Temperature sensing and protection using integrated Differential and Single-ended Programmable-Gain Amplifiers, comparators and DACs
Lowest standby power Allows 18µA Iq for standby-mode
IEC/UL60730 Class B Optimization Allows implementation of the IEC/UL60730 Class B standard without additional system cost for PCB components.

Supporting Evaluation Tools


The ET-COLINK-1 adapter allows the user to program and perform source level debugging of the target device using SWD from a PC. This adapter is required when using the CooCox CoIDE for development. This IDE and adapter will allow the user to program FLASH on the device, as well as perform source-level debugging of the application.

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The ET-UARTISO-1 adapter allows the user to connect the graphical user interface (GUI) to the target board via USB. The adapter allows the user to access the UART serial channel on the PAC device, so that the GUI may be used for evaluation and debugging of an operating system.

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PAC5xxx Flash Programmer Tools

Active-Semi has partnered with Flash Programmer solution providers to support our Intelligent Motor Control PAC® product families.
These proven tools are suitable for emerging and high volume product manufacturing.
Both package level (socketed) and board level Flash programming solutions are available.

Active-Semi will support other vendors familiar with Arm® Serial Wire Debug (SWD) protocol to add PAC® product compatibility on their existing Flash programmer platforms.

For more details contact

PAC52xx BLDC Application Firmware

Installer for the PAC52XX BLDC application firmware, which implements sensored BLDC and sensorless BEMF motor control on all members of the PAC52XX family.  The installer contains example application source code, Windows graphical user interface (GUI), and documentation to allow the user to configure the system to work with their target motor.  Project files for CooCox CoIde, IAR Systems Embedded Workbench for ARM (EWARM) and Keil uVision are included.

Version: Aug 24 2018
PAC® FOC Application Firmware

Installer for the PAC® FOC application firmware designed to show case motor control using sensorless Field Oriented Control (FOC) on all PAC® devices.  The installer contains example FOC application source code, Windows graphical user interface (GUI), and documentation to allow the user to configure the system to work with their target motor.   Project files for IAR Systems Embedded Workbench for Arm® (EWARM), Keil uVision, Eclipse, and CooCox CoIde are included. The FOC application provides a configurable set of features to meet many different application requirements such as sensorless position/speed estimator, start-in-motion (SIM), three or single shunt operation, open phase detection (OPD), field weakening and others.

Version: v4.0.1
PAC52xx Software Development Kit

Installer for the PAC52XX Software Development Kit (SDK) that provides register level definitions and peripheral driver APIs for developing ARM M0 application firmware on all PAC52XX devices.  The PAC52XX SDK is a unified SDK that supports Keil µVision IDE, IAR Systems Embedded Workbench for ARM (EWARM) IDE, and GCC tool chains.

Version: v2.4.4 Aug 24 2018

PAC52xx IDE Support

Development of application firmware for PAC52XX Arm® Cortex® M0 is made easy with standard integrated development environments (IDEs). Several of the most popular IDEs contain support for PAC52XX devices including Keil uVision, IAR Systems Embedded Workbench for Arm®, and Coocox CoIDE. Eclipse development is possible using J-Link by downloading and installing the “Eclipse with PAC® support” package.

PAC52XX_Keil_IDE_Guide Guide for installing Keil uVision for development of PAC52XX application firmware.
PAC52XX_Keil_IDE_Upgrade_v1.0.9_pack_to_v2.0.0_pack Guide for upgrading the Keil uVision PAC52XX .pack from v1.0.9 to v2.0.0.
PAC52XX_IAR_IDE_Guide Guide for installing IAR Systems Embedded Workbench IDE for development of PAC52XX application firmware.
PAC52XX_CooCox_IDE_Guide Guide for installing CooCox CoIDE for development of PAC52XX application firmware.
Installer for Eclipse and supporting plugins for development on the PAC ® family of devices.